Characterization of Direct Metal Deposition (DMD) Bimetallic Interfaces

摘要

Direct metal deposition (DMD), also known as free-form additive manufacturing (AM), is a process using either a blown powder or wire-feedstock and generally based on a robotic arm or CNC platform. These AM methods provide the crucial advantage of having the ability to build outside of a box, allowing for larger builds, and the capability to use multiple metals to produce bimetallic builds. In this study, the abilities of both wire-fed and blown powder DMD to produce bimetallic components were investigated focusing on the interface formed between copper (Cu) alloy C18150 and DMD AM deposited nickel (Ni) based superalloy Inconel 625. The interfaces between the two alloys were evaluated using a variety of tests. The resultant finding indicated the interfacial bonding mechanisms were mechanical mixing of the alloys in the wire-fed DMD AM processes and diffusion of the alloys into one another in the blown powder processes.